Hey all, hopefully the community here can answer my question because no one in my "real life" contact list can figure this one out...
My manual-transmission car will violently shake back and forth when (what i call) the car "pulls". Meaning uphill or otherwise pulling the car harder than it needs to in a normal "cruise" speed. And after re-reading this, im really not sure that it even makes sense.
- First and Second gear RARELY do it, however 3rd gear is usually the prime gear that this occurs. The shaking starts about 2 seconds AFTER i shift (successfully) into gear. Ive never seen it happen to 4th gear.
- Once it starts its shaking, i can either let off the gas and it will stop immediately, or i can floor it (thus applying more gas) and it will stop as well.
- The car, while shaking, will accelerate normally. There is no noise, no clacking, and no smell. I maintain proper speed and it will eventually calm down (usually because i throw the clutch in and shift to 4th).
- It doesnt appear to be an RPM issue, as it can vary depending on what state my car is in (pulling vs. slow accel)
- My number 1 suspect was the spark plugs, but i replaced those and it still happens. I have done all of the normal maintenance i can think of. Still happens every day.
- No check engine
I would appreciate ANY help you guys have...even if its just a suspicion...thank you!